Any question you are interested in would be good! Checking out some sample oxbridge interview questions would also be quite a good starting point to get you thinking, if you are struggling to think of ideas. They have pretty interesting thoughts as they are designed by the tutors!
There isn't any difference on the economics side as you have access to the same modules for this part. It's the additional option of having management modules to choose from which makes the difference. You can also choose how much of your degree is econ or management. For example, 70% econ papers/30% management papers to tailor more to your interests. Econ is also highly mathematical, whereas e&m you can get away with slightly less maths. Ultimately, it's the management part which makes the subject distinct so make sure you are interested in that. www.sbs.ox.ac.uk/programmes/degrees/bahons-economics-and-management/reading-list Maybe check out a couple of books on this list before choosing!
